Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy)
In the lowermost Eocene sedimentary record of Ocean Drilling Program Site 1262 (Leg 208, Walvis Ridge, South Atlantic Ocean), the presence of a similar to 53-kyr-long normal polarity event has been recorded within the similar to 2.55-Myr-long reverse polarity Chron C24r (similar to 53.355.9 Ma) and...
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ftunivmilanoair:oai:air.unimi.it:2434/203973 2024-02-11T10:08:37+01:00 Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) E. Dallanave C. Agnini L. Tauxe D. Rio G. Muttoni E. Dallanave G. Muttoni C. Agnini L. Tauxe D. Rio 2012-11 http://hdl.handle.net/2434/203973 https://doi.org/10.1111/j.1365-246X.2012.05627.x eng eng Wiley info:eu-repo/semantics/altIdentifier/wos/WOS:000309753800010 volume:191 issue:2 firstpage:517 lastpage:529 numberofpages:13 journal:GEOPHYSICAL JOURNAL INTERNATIONAL http://hdl.handle.net/2434/203973 doi:10.1111/j.1365-246X.2012.05627.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84867395900 info:eu-repo/semantics/openAccess Magnetostratigraphy Reversals: proce timescale Rock and mineral magnetism Settore GEO/02 - Geologia Stratigrafica e Sedimentologica info:eu-repo/semantics/article 2012 ftunivmilanoair https://doi.org/10.1111/j.1365-246X.2012.05627.x 2024-01-16T23:22:14Z In the lowermost Eocene sedimentary record of Ocean Drilling Program Site 1262 (Leg 208, Walvis Ridge, South Atlantic Ocean), the presence of a similar to 53-kyr-long normal polarity event has been recorded within the similar to 2.55-Myr-long reverse polarity Chron C24r (similar to 53.355.9 Ma) and termed PalaeoceneEocene magnetic reversal (PEMR). The origin of the PEMR has been speculatively related to a change in the Earth's rotation rate that was in turn influenced by an abrupt overturning of the ocean-atmosphere circulation that occurred during the PalaeoceneEocene thermal maximum (PETM) at similar to 55 Ma. Such provocative genesis for a magnetic-polarity reversal demands the PEMR to be confirmed (or refuted) in additional PETM sections. Here, we present detailed palaeomagnetic and rock-magnetic data from the Forada and Cicogna sections of the Belluno Basin in NE Italy, which contain an expanded and continuous record of the PETM termed clay marl unit (CMU). Our data indicate that these sediments were deposited during a continuous interval of reverse geomagnetic field polarity. We therefore conclude that no magnetic-polarity reversals occurred throughout the PETM. In addition, we studied the origin of the high degree of flattening affecting the characteristic magnetic component directions of the sediments, which we interpret as due to a combination of depositional inclination shallowing typical of detrital haematite, and post-depositional compaction of clays, particularly abundant in the carbonate-depleted CMU. Article in Journal/Newspaper South Atlantic Ocean The University of Milan: Archivio Istituzionale della Ricerca (AIR) Geophysical Journal International 191 2 517 529 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Magnetostratigraphy Reversals: proce timescale Rock and mineral magnetism Settore GEO/02 - Geologia Stratigrafica e Sedimentologica |
spellingShingle |
Magnetostratigraphy Reversals: proce timescale Rock and mineral magnetism Settore GEO/02 - Geologia Stratigrafica e Sedimentologica E. Dallanave C. Agnini L. Tauxe D. Rio G. Muttoni Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) |
topic_facet |
Magnetostratigraphy Reversals: proce timescale Rock and mineral magnetism Settore GEO/02 - Geologia Stratigrafica e Sedimentologica |
description |
In the lowermost Eocene sedimentary record of Ocean Drilling Program Site 1262 (Leg 208, Walvis Ridge, South Atlantic Ocean), the presence of a similar to 53-kyr-long normal polarity event has been recorded within the similar to 2.55-Myr-long reverse polarity Chron C24r (similar to 53.355.9 Ma) and termed PalaeoceneEocene magnetic reversal (PEMR). The origin of the PEMR has been speculatively related to a change in the Earth's rotation rate that was in turn influenced by an abrupt overturning of the ocean-atmosphere circulation that occurred during the PalaeoceneEocene thermal maximum (PETM) at similar to 55 Ma. Such provocative genesis for a magnetic-polarity reversal demands the PEMR to be confirmed (or refuted) in additional PETM sections. Here, we present detailed palaeomagnetic and rock-magnetic data from the Forada and Cicogna sections of the Belluno Basin in NE Italy, which contain an expanded and continuous record of the PETM termed clay marl unit (CMU). Our data indicate that these sediments were deposited during a continuous interval of reverse geomagnetic field polarity. We therefore conclude that no magnetic-polarity reversals occurred throughout the PETM. In addition, we studied the origin of the high degree of flattening affecting the characteristic magnetic component directions of the sediments, which we interpret as due to a combination of depositional inclination shallowing typical of detrital haematite, and post-depositional compaction of clays, particularly abundant in the carbonate-depleted CMU. |
author2 |
E. Dallanave G. Muttoni C. Agnini L. Tauxe D. Rio |
format |
Article in Journal/Newspaper |
author |
E. Dallanave C. Agnini L. Tauxe D. Rio G. Muttoni |
author_facet |
E. Dallanave C. Agnini L. Tauxe D. Rio G. Muttoni |
author_sort |
E. Dallanave |
title |
Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) |
title_short |
Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) |
title_full |
Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) |
title_fullStr |
Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) |
title_full_unstemmed |
Is there a normal magnetic-polarity event during the Palaeocene–Eocene thermal maximum (∼55 Ma)? Insights from the palaeomagnetic record of the Belluno Basin (Italy) |
title_sort |
is there a normal magnetic-polarity event during the palaeocene–eocene thermal maximum (∼55 ma)? insights from the palaeomagnetic record of the belluno basin (italy) |
publisher |
Wiley |
publishDate |
2012 |
url |
http://hdl.handle.net/2434/203973 https://doi.org/10.1111/j.1365-246X.2012.05627.x |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000309753800010 volume:191 issue:2 firstpage:517 lastpage:529 numberofpages:13 journal:GEOPHYSICAL JOURNAL INTERNATIONAL http://hdl.handle.net/2434/203973 doi:10.1111/j.1365-246X.2012.05627.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84867395900 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/j.1365-246X.2012.05627.x |
container_title |
Geophysical Journal International |
container_volume |
191 |
container_issue |
2 |
container_start_page |
517 |
op_container_end_page |
529 |
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1790608055786799104 |